Age distribution of Coma early-type galaxies small, average, and large for their mass, respectively. The plot is a standard box-whisker; the vertical box width delimits the 1st and 3rd quartile, while the median (2rd quartile) is indicated by the blue horizontal segment inside the box. The horizontal box width gives the full x range of each bin, while the error bars reach the minimum and maximum in the ordinate. Observed ages can be older than the Universe age because of errors.